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    <title>Document</title>
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<script>
    // 1. 构造函数的问题.
    function Star(uname, age) {
        this.uname = uname;
        this.age = age;
        // this.sing = function() {
        //     console.log('我会唱歌');

        // }
    }

    Star.prototype.sing = function () {
        console.log('我会唱歌');
    }
    var ldh = new Star('刘德华', 18);
    var zxy = new Star('张学友', 19);
    console.log(ldh.sing === zxy.sing);
    console.dir(Star);
    ldh.sing();
    zxy.sing();
    // 2. 一般情况下,我们的公共属性定义到构造函数里面, 公共的方法我们放到原型对象身上
</script>
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